Where are you trying to sign in, Joey - in Lightroom Desktop or in the mobile app on your mobile device? If in Desktop, what shows in the Lightroom mobile tab in Lightroom>Preferences? Does that show you signed in?
If you're signed in, try checking the sync box to the left of a collection. Is there a message above the identity plate in the top left that the photos are syncing?
For once you get signed in, here's a video tutorial on how to get started with Lightroom mobile.
I´m trying to sign into the Desktop version. Using the 'Sync with Lightroom Mobile - Sign In'.
But nothing happens when I use that option.
In preferences > mobile it say's I'm not connected with Mobile.
Signing into Lightroom Mobile on my phone is not a problem. But I need to sync between the two.
Fixed by Adobe Customer Service.